Optical lens

Abstract

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface, the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface; the fourth lens has negative focal power; the fifth lens has focal power, and the object side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; the seventh lens has positive focal power; the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy 0 lt; (R5-R6) / (R5 + R6) lt; 4.0, 0. According to the optical lens provided by the invention, through reasonable configuration of the surface types of the lenses and reasonable matching of the focal power, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Art

[0002] As people's requirements for driving experience continue to increase, automotive optical lenses are increasingly used in intelligent driving, and the status of automotive optical lenses in the automotive-related industries continues to improve.

[0003] The panoramic view system sets up multiple surround view cameras around the car to cover the entire field of view around the vehicle, and fuses the perspectives of multiple cameras into a 360-degree overhead view of the surrounding vehicle body, which is finally displayed on the screen of the center console, allowing the driver to clearly check whether there are obstacles around the vehicle and understand the relative position and distance of the obstacles, helping the driver to park the vehicle easily. Not only is it very intuitive, but there are no blind spots, which can help the driver calmly control the vehicle to park or pass through complex roads, effectively reducing the occurrence of scratches, collisions, sinking and other accidents.

[0004] At present, surround-view camera lenses generally use wide-angle lenses, which have problems such as large aberrations, large field curvature, and poor image quality, making it difficult to meet user needs. Summary of the invention

[0005] In view of the above problems, an object of the present invention is to provide an optical lens having the advantage of excellent imaging quality.

[0006] The present invention provides an optical lens, which comprises seven lenses in total, and includes the following lenses in order from the object side to the imaging surface along the optical axis:

[0007] The first lens has a negative optical power, and its object side surface is convex and its image side surface is concave;

[0008] A second lens having negative optical power, whose image side surface is concave;

[0009] a third lens having optical power and having a convex object-side surface;

[0010] a fourth lens having negative optical power;

[0011] a fifth lens having optical power and having a convex object-side surface;

[0012] a sixth lens having positive refractive power and a convex object-side surface;

[0013] a seventh lens having positive refractive power;

[0014] The object-side curvature radius R5 of the third lens and the image-side curvature radius R6 of the third lens satisfy: 0<(R5-R6) / (R5+R6)<4.0.

[0015] Further preferably, the total optical length TTL and the effective focal length f of the optical lens satisfy: 8.0 <TTL / f<11.0。

[0016] Further preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 2.5 <TTL / IH<3.5。

[0017] Further preferably, the effective focal length f of the optical lens, the arc θ of the maximum half field of view angle, and the real image height IH corresponding to the maximum field of view angle satisfy: 0.8<(IH / 2) / (f×θ)<1.0.

[0018] Further preferably, the maximum field of view FOV and aperture value FNO of the optical lens meet the following requirements: 80° <FOV / FNO<120°。

[0019] Further preferably, the real image height IH and entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens satisfy: 4.0 <IH / EPD<7.0。

[0020] Further preferably, the optical back focal length BFL and the effective focal length f of the optical lens satisfy: 1.0 <BFL / f<2.5。

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -4.0 <f1 / f<-2.0。

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: f2 / f<-2.0.

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -4.5 <f3 / f<9.0。

[0024] The optical lens provided by the present invention improves the imaging quality of the optical lens, reduces aberrations, and improves the imaging quality of the optical lens through reasonable configuration of the surface shapes of each lens and reasonable matching of the optical focal length. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0027] Figure 2 It is a field curvature curve diagram of the optical lens in Example 1 of the present invention.

[0028] Figure 3: is the F-Theta distortion curve of the optical lens in Example 1 of the present invention.

[0029] Figure 4 This is a relative illumination curve diagram of the optical lens in Example 1 of the present invention.

[0030] Figure 5 This is the MTF curve diagram of the optical lens in Example 1 of the present invention.

[0031] Figure 6 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0032] Figure 7 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0033] Figure 8 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0034] Fig. 9 4 is a field curvature curve diagram of the optical lens in Example 2 of the present invention.

[0035] Fig.10 : is the F-Theta distortion curve of the optical lens in Example 2 of the present invention.

[0036] Fig.11 This is a relative illumination curve diagram of the optical lens in Example 2 of the present invention.

[0037] Fig.12 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.

[0038] Fig.13 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0039] Fig.14 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0040] Fig.15 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0041] Fig.16 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0042] Fig.17 : is the F-Theta distortion curve of the optical lens in Example 3 of the present invention.

[0043] Fig.18 This is a relative illumination curve diagram of the optical lens in Example 3 of the present invention.

[0044] Fig.19 This is the MTF curve diagram of the optical lens in Example 3 of the present invention.

[0045] Fig. 20 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0046] Fig.21 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0047] Fig. 22 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0048] Fig.23 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0049] Fig.24 : is the F-Theta distortion curve of the optical lens in Example 4 of the present invention.

[0050] Fig.25 This is a relative illumination curve diagram of the optical lens in Example 4 of the present invention.

[0051] Fig.26 This is the MTF curve diagram of the optical lens in Example 4 of the present invention.

[0052] Fig. 27 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0053] Fig.28 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0054] Fig.29 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0055] Fig.30 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention.

[0056] Fig.31 : is the F-Theta distortion curve of the optical lens in Example 5 of the present invention.

[0057] Fig.32 This is a relative illumination curve diagram of the optical lens in Example 5 of the present invention.

[0058] Fig.33 This is the MTF curve diagram of the optical lens in Example 5 of the present invention.

[0059] Fig.34 Graph showing the axial aberration of the optical lens in Embodiment 5 of the present invention.

[0060] Fig.35 Graph showing the vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0061] Fig.36 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0062] Fig.37 4 is a field curvature curve diagram of the optical lens in Example 6 of the present invention.

[0063] Fig.38 : is the F-Theta distortion curve of the optical lens in Example 6 of the present invention.

[0064] Fig.39 This is a relative illumination curve diagram of the optical lens in Example 6 of the present invention.

[0065] Fig.40 This is the MTF curve diagram of the optical lens in Example 6 of the present invention.

[0066] Fig.41 Graph showing the axial aberration of the optical lens in Embodiment 6 of the present invention.

[0067] Fig.42 Graph showing the vertical axis chromatic aberration of the optical lens in Example 6 of the present invention.

[0068] Fig.43 Schematic diagram of the structure of the optical lens in Example 7 of the present invention.

[0069] Fig.44 4 is a field curvature curve diagram of the optical lens in Example 7 of the present invention.

[0070] Fig.45 : is the F-Theta distortion curve of the optical lens in Example 7 of the present invention.

[0071] Fig.46 This is a relative illumination curve diagram of the optical lens in Example 7 of the present invention.

[0072] Fig.47 This is the MTF curve diagram of the optical lens in Example 7 of the present invention.

[0073] Fig.48 Graph showing the axial aberration of the optical lens in Embodiment 7 of the present invention.

[0074] Fig.49 Graph showing the vertical axis chromatic aberration of the optical lens in Example 7 of the present invention.

[0075] Fig.50 Schematic diagram of the structure of the optical lens in Example 8 of the present invention.

[0076] Fig.51 4 is a field curvature curve diagram of the optical lens in Example 8 of the present invention.

[0077] Fig.52: is the F-Theta distortion curve of the optical lens in Example 8 of the present invention.

[0078] Fig.53 This is a relative illumination curve diagram of the optical lens in Example 8 of the present invention.

[0079] Fig.54 This is the MTF curve diagram of the optical lens in Example 8 of the present invention.

[0080] Fig.55 4 is an axial aberration curve diagram of the optical lens in Example 8 of the present invention.

[0081] Fig.56 Graph showing the vertical axis chromatic aberration of the optical lens in Example 8 of the present invention.

[0082] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0083] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0084] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0085] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0086] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0087] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0088] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0089] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0090] The optical lens of the embodiment of the present invention includes, in order from the object side to the imaging surface along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a filter and a protective glass, and an aperture is provided between the third lens and the fourth lens or between the fourth lens and the fifth lens.

[0091] In some embodiments, the first lens may have a negative optical power, which is beneficial to reduce the inclination angle of the incident light, thereby effectively sharing the large field of view on the object side. The object side of the first lens is convex, and the image side is concave; it is beneficial to collect the edge field of view light as much as possible to enter the rear optical lens, and realize large-angle light collection.

[0092] In some embodiments, the second lens may have a negative focal length, which can share the negative focal length of the front end of the lens, thereby reducing the excessive deflection of light caused by the excessive concentration of the focal length of the first lens, and reducing the difficulty of correcting the chromatic aberration of the optical lens. The image side of the second lens is a concave surface, which is conducive to converging the outgoing light and avoiding the outer diameter of the lens being too large.

[0093] In some embodiments, the third lens has a focal power, and its object side is convex. The third lens may have a positive focal power, which is beneficial to improving the light converging ability of the optical lens, balancing various aberrations generated by the optical lens, and enhancing the imaging quality of the optical lens. The third lens may also have a negative focal power, which is beneficial to reducing the light deflection angle, enabling the light to transition smoothly, and enhancing the imaging quality of the optical lens.

[0094] In some embodiments, the fourth lens may have a negative focal power; this is beneficial to reducing the light deflection angle, enabling the light to transition smoothly, and enhancing the imaging quality of the optical lens.

[0095] In some embodiments, the fifth lens has a focal power, and its object side is convex. The fifth lens may have a positive focal power, which is beneficial to improving the light converging ability of the optical lens, balancing various aberrations generated by the optical lens, and enhancing the imaging quality of the optical lens. The fifth lens may also have a negative focal power, which is beneficial to reducing the light deflection angle, enabling the light to transition smoothly, and enhancing the imaging quality of the optical lens.

[0096] In some embodiments, the sixth lens may have a positive focal power, and its object side is convex; this is beneficial to improving the light converging ability of the optical lens, balancing various aberrations generated by the optical lens, and enhancing the imaging quality of the optical lens.

[0097] In some embodiments, the seventh lens may have a positive focal power; this is beneficial to suppressing the angle of the marginal field of view incident on the imaging surface, effectively transmitting more light beams to the imaging surface, and enhancing the imaging quality of the optical lens.

[0098] In some embodiments, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy: 0 < (R5 - R6) / (R5 + R6) < 4.0. Satisfying the above range can effectively correct the spherical aberration of the optical lens and is also beneficial to shortening the overall optical length to meet the requirements of miniaturization.

[0099] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f satisfy: 8.0 < TTL / f < 11.0. Satisfying the above range ensures that there is enough space to adjust the lens structure and optimize the imaging effect.

[0100] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle satisfy: 2.5 < TTL / IH < 3.5. Satisfying the above range can effectively balance the requirements of the image height and miniaturization of the optical lens.

[0101] In some embodiments, the effective focal length f of the optical lens, the radian θ of the maximum half field of view angle, and the true image height IH corresponding to the maximum field of view angle satisfy: 0.8 < (IH / 2) / (f×θ) < 1.0. Meeting the above range is beneficial to controlling the smooth change of the edge distortion of the optical lens, which is convenient for later restoration through software algorithms.

[0102] In some embodiments, the maximum field of view angle FOV of the optical lens and the aperture value FNO satisfy: 80° < FOV / FNO < 120°. Meeting the above range is beneficial to expanding the field of view angle of the optical lens and increasing the aperture of the optical lens, which is beneficial for the optical lens to obtain more scene information and meet the requirements of large range detection. The realization of the large aperture characteristic is beneficial to improving the problem that the relative brightness of the edge field of view drops rapidly, and thus is also beneficial to obtaining more scene information.

[0103] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD satisfy: 4.0 < IH / EPD < 7.0. Meeting the above range can increase the width of the light beam incident on the optical lens, so that the brightness at the image plane of the optical lens is improved and vignetting is avoided.

[0104] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle satisfy: 2.5 < IH / f < 4.0. Meeting the above range is beneficial to achieving a balance between the field of view angle and the size of the F-Theta distortion of the optical lens, and improving the imaging quality of the optical lens.

[0105] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f satisfy: 1.0 < BFL / f < 2.5. Meeting the above range is beneficial to achieving a balance between obtaining good imaging quality and an easily assembled back focal length, ensuring the imaging quality of the optical lens while avoiding interference between the lens and other components, and reducing the assembly process difficulty of the camera module.

[0106] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -4.0 < f1 / f < -2.0. Meeting the above range can make the first lens have an appropriate negative optical power, which is beneficial to reducing the inclination angle of the incident light, and is beneficial to collecting the edge field of view light into the rear optical lens as much as possible to achieve large-angle light collection.

[0107] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: f2 / f < -2.0. Meeting the above range can share the negative optical power at the front end of the lens, which is beneficial to reducing the excessive light deflection caused by the over-concentration of the optical power of the first lens and reducing the difficulty of chromatic aberration correction of the optical lens.

[0108] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -4.5 < f3 / f < 9.0. Meeting the above range can make the third lens have an appropriate optical power, enabling the light rays to transition smoothly, and improving the imaging quality of the optical lens.

[0109] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -8.5 < f4 / f < -4.0. Meeting the above range can make the fourth lens have an appropriate negative optical power, which is beneficial to reducing the light ray deflection angle, enabling the light rays to transition smoothly, and improving the imaging quality of the optical lens.

[0110] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -5.5 < f5 / f < 2.5. Meeting the above range can make the fifth lens have an appropriate optical power, enabling the light rays to transition smoothly, and improving the imaging quality of the optical lens.

[0111] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.0 < f6 / f < 4.0. Meeting the above range can make the sixth lens have an appropriate positive optical power, which is beneficial to improving the light ray convergence ability of the optical lens, balancing various aberrations generated by the optical lens, and improving the imaging quality of the optical lens.

[0112] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 3.0 < f7 / f < 13.0. Meeting the above range can make the seventh lens have an appropriate positive optical power, which is beneficial to suppressing the angle of the marginal field of view incident on the imaging surface, effectively transmitting more light beams to the imaging surface, and improving the imaging quality of the optical lens.

[0113] In some embodiments, the maximum field of view FOV of the optical lens satisfies: 175° < FOV < 225°. Meeting the above range can enable the optical lens to have a large field of view.

[0114] In some embodiments, the aperture value FNO of the optical lens satisfies: 1.5 < FNO < 2.5. Meeting the above range is beneficial to realizing the large aperture characteristic of the lens, increasing the light transmission amount, and improving the imaging effect of the lens in a dim environment.

[0115] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 0.5 < (R1 - R2) / (R1 + R2) < 0.8. Meeting the above range can尽可能 reduce the distortion generated by the first lens, reduce the requirements for subsequent lens distortion correction, and improve the imaging quality of the optical lens.

[0116] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 3.5 < R1 / R2 < 8.5. Meeting the above range is conducive to achieving the wide-angle characteristic, so as to obtain more scene information and meet the requirements of large-range detection of the optical lens.

[0117] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -3.0 < R3 / R4 < 8.5. Meeting the above range balances the aberration generated by the second lens itself, thereby improving the imaging quality of the lens.

[0118] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 5.0 < R1 / f. The radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: R2 / f < 1.9. Meeting the above range is conducive to achieving the ultra-wide-angle characteristic, so as to obtain more scene information and meet the requirements of large-range detection of the optical lens.

[0119] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 0.4 < ∑CT / TTL < 0.7. Meeting the above range is conducive to the structural design and production process of the optical lens.

[0120] In some embodiments, the effective focal length f of the optical lens and the central thickness CT3 of the third lens along the optical axis satisfy: 0.3 < CT3 / f < 2.5. Meeting the above range can improve the field curvature of the ultra-wide-angle lens by setting the thickness of the third lens, reduce the difficulty of optimizing the lens aberration, and thereby improve the imaging quality of the lens.

[0121] In some embodiments, the fourth lens and the fifth lens can be glued together to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing technology difficulty of the optical lens and improving the assembly yield of the optical lens.

[0122] In some embodiments, the fifth lens and the sixth lens can be glued together to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing technology difficulty of the optical lens and improving the assembly yield of the optical lens.

[0123] In some embodiments, the seventh lens can adopt the aspherical lens surface type to improve the resolution quality.

[0124] In order to make the system have better optical performance, an aspherical lens is used in the lens, and the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0125]

[0126] Among them, z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, A, B, C, D, E, and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients respectively.

[0127] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0128] Example 1

[0129] See also Figure 1 , which is a schematic diagram of the structure of the optical lens provided in Embodiment 1 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0130] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0131] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both concave;

[0132] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both convex;

[0133] The fourth lens L4 has negative refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0134] Aperture ST;

[0135] The fifth lens L5 has negative refractive power, and its object-side surface S9 is convex, and its image-side surface S10 is concave;

[0136] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0137] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0138] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0139] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0140] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0141] The imaging surface S18 is a plane.

[0142] The relevant parameters of each lens in the optical lens in Example 1 are shown in Table 1-1.

[0143] Table 1-1

[0144]

[0145] The surface parameters of the aspherical lens of the optical lens in Example 1 are shown in Table 1-2.

[0146] Table 1-2

[0147] Face number K A B C D E F S12 1.02E+02 0.00E+00 -6.25E-03 5.56E-04 -2.48E-04 3.05E-05 -1.68E-06 S13 1.43E+00 0.00E+00 -1.93E-03 7.65E-05 -3.74E-05 3.09E-06 -9.63E-08

[0148] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown.

[0149] Figure 2 The field curvature curve of Example 1 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.05mm to 0.15mm, indicating that the optical lens can correct the field curvature well.

[0150] Figure 3The F-Theta distortion curve of Example 1 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -10% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0151] Figure 4 The relative illumination curve of Example 1 is shown, which represents the relative illumination values ​​at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 50% at the maximum half viewing angle, indicating that the optical lens has good relative illumination.

[0152] Figure 5 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0153] Figure 6 The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within ±15μm, indicating that the optical lens can correct the axial aberration well.

[0154] Figure 7 The vertical chromatic aberration curve of Example 1 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 4 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0155] Example 2

[0156] See also Figure 8, which is a schematic diagram of the structure of the optical lens provided in Embodiment 2 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0157] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0158] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both concave;

[0159] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both convex;

[0160] The fourth lens L4 has negative refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0161] Aperture ST;

[0162] The fifth lens L5 has negative refractive power, and its object-side surface S9 is convex, and its image-side surface S10 is concave;

[0163] The sixth lens L6 has positive refractive power, an object-side surface S10 thereof is convex, and an image-side surface S11 thereof is concave;

[0164] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0165] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0166] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0167] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0168] The imaging surface S18 is a plane.

[0169] The relevant parameters of each lens in the optical lens in Example 2 are shown in Table 2-1.

[0170] Table 2-1

[0171]

[0172]

[0173] The surface parameters of the aspherical lens of the optical lens in Example 2 are shown in Table 2-2.

[0174] Table 2-2

[0175] Face number K A B C D E F S12 1.63E+01 0.00E+00 -3.34E-03 -2.13E-04 1.83E-05 -2.83E-06 8.83E-08 S13 2.71E+01 0.00E+00 -1.02E-03 -2.07E-04 2.26E-05 -1.61E-06 4.70E-08

[0176] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 shown.

[0177] Fig. 9 The field curvature curve of Example 2 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.03mm to 0.09mm, indicating that the optical lens can correct the field curvature well.

[0178] Fig.10 The F-Theta distortion curve of Example 2 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -8% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0179] Fig.11 The relative illumination curve of Example 2 is shown, which represents the relative illumination values ​​at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 50% at the maximum half viewing angle, indicating that the optical lens has good relative illumination.

[0180] Fig.12 The MTF (Modulation Transfer Function) curve of Example 2 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.3 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0181] Fig.13The axial aberration curve of Example 2 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -6μm to 20μm, indicating that the optical lens can correct the axial aberration well.

[0182] Fig.14 The vertical chromatic aberration curve of Example 2 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 3 μm, indicating that the optical lens can perfectly correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0183] Example 3

[0184] See also Fig.15 , shown is a schematic diagram of the structure of the optical lens provided in Example 3 of the present invention. Compared with Example 1, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0185] The relevant parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.

[0186] Table 3-1

[0187]

[0188] The surface parameters of the aspherical lens of the optical lens in Example 3 are shown in Table 3-2.

[0189] Table 3-2

[0190] Face number K A B C D E F S12 2.00E+02 0.00E+00 -6.65E-03 -5.01E-04 1.29E-04 -2.57E-05 1.79E-06 S13 2.00E+02 0.00E+00 -5.42E-03 -2.33E-04 5.28E-05 -8.70E-06 5.55E-07

[0191] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig.16 , Fig.17 , Fig.18 , Fig.19 , Fig. 20 , Fig.21 shown.

[0192] Fig.16The field curvature curve of Example 3 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.08mm to 0.08mm, indicating that the optical lens can correct the field curvature well.

[0193] Fig.17 The F-Theta distortion curve of Example 3 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -10% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0194] Fig.18 The relative illumination curve of Example 3 is shown, which represents the relative illumination values ​​at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 70% at the maximum half viewing angle, indicating that the optical lens has a good relative illumination.

[0195] Fig.19 The MTF (Modulation Transfer Function) curve of Example 3 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.3 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0196] Fig. 20 The axial aberration curve of Example 3 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -15μm to 18μm, indicating that the optical lens can correct the axial aberration well.

[0197] Fig.21The vertical chromatic aberration curve of Example 3 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -4 μm to 5 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0198] Example 4

[0199] See also Fig. 22 , which is a schematic diagram of the structure of the optical lens provided in Embodiment 4 of the present invention, wherein the optical lens comprises, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0200] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0201] The second lens L2 has negative refractive power, its object side surface S3 is convex, and its image side surface S4 is concave;

[0202] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0203] Aperture ST;

[0204] The fourth lens L4 has negative refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is concave;

[0205] The fifth lens L5 has positive refractive power, and its object-side surface S8 and image-side surface S9 are both convex surfaces;

[0206] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface between the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is S8;

[0207] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0208] The seventh lens L7 has positive refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0209] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0210] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0211] The imaging surface S18 is a plane.

[0212] The relevant parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.

[0213] Table 4-1

[0214]

[0215]

[0216] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0217] Table 4-2

[0218] Face number K A B C D E F S12 -1.00E+02 0.00E+00 -2.41E-03 1.81E-04 -2.86E-05 1.89E-06 -4.05E-08 S13 -1.00E+02 0.00E+00 -2.62E-03 3.19E-04 -3.21E-05 1.79E-06 -3.23E-08

[0219] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig.23 , Fig.24 , Fig.25 , Fig.26 , Fig. 27 , Fig.28 shown.

[0220] Fig.23 The field curvature curve of Example 4 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.09mm to 0.05mm, indicating that the optical lens can well correct the field curvature.

[0221] Fig.24 The F-Theta distortion curve of Example 4 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -10% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0222] Fig.25 The relative illumination curve of Example 4 is shown, which represents the relative illumination values ​​at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 50% at the maximum half viewing angle, indicating that the optical lens has good relative illumination.

[0223] Fig.26The MTF (Modulation Transfer Function) curve of Example 4 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0224] Fig. 27 The axial aberration curve of Example 4 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -5μm to 20μm, indicating that the optical lens can correct the axial aberration well.

[0225] Fig.28 The vertical chromatic aberration curve of Example 4 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -4 μm to 6 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0226] Example 5

[0227] See also Fig.29 , which is a schematic diagram of the structure of the optical lens provided in Example 5 of the present invention. Compared with Example 4, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0228] The relevant parameters of each lens in the optical lens in Example 5 are shown in Table 5-1.

[0229] Table 5-1

[0230]

[0231]

[0232] The surface parameters of the aspherical lens of the optical lens in Example 5 are shown in Table 5-2.

[0233] Table 5-2

[0234] Face number K A B C D E F S12 -1.00E+02 0.00E+00 -1.45E-02 1.78E-03 -1.33E-04 5.52E-06 -9.80E-08 S13 -2.45E+01 0.00E+00 -1.18E-02 1.48E-03 -9.27E-05 3.38E-06 -5.29E-08

[0235] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig.30 , Fig.31 , Fig.32 , Fig.33 , Fig.34 , Fig.35 shown.

[0236] Fig.30 The field curvature curve of Example 5 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.05mm to 0.1mm, indicating that the optical lens can correct the field curvature well.

[0237] Fig.31 The F-Theta distortion curve of Example 5 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -10% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0238] Fig.32 The relative illumination curve of Example 5 is shown, which represents the relative illumination values ​​at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 50% at the maximum half viewing angle, indicating that the optical lens has a good relative illumination.

[0239] Fig.33 The MTF (Modulation Transfer Function) curve of Example 5 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.3 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0240] Fig.34The axial aberration curve of Example 5 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 50μm, indicating that the optical lens can correct the axial aberration well.

[0241] Fig.35 The vertical chromatic aberration curve of Example 5 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -5 μm to 6 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0242] Example 6

[0243] See also Fig.36 , which is a schematic diagram of the structure of the optical lens provided in Example 6 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0244] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0245] The second lens L2 has negative refractive power, its object side surface S3 is convex, and its image side surface S4 is concave;

[0246] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0247] Aperture ST;

[0248] The fourth lens L4 has negative refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is concave;

[0249] The fifth lens L5 has positive refractive power, and its object-side surface S8 and image-side surface S9 are both convex surfaces;

[0250] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface between the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is S8;

[0251] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0252] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0253] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0254] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0255] The imaging surface S18 is a plane.

[0256] The relevant parameters of each lens in the optical lens in Example 6 are shown in Table 6-1.

[0257] Table 6-1

[0258]

[0259]

[0260] The surface parameters of the aspherical lens of the optical lens in Example 6 are shown in Table 6-2.

[0261] Table 6-2

[0262] Face number K A B C D E F S12 -9.97E+01 0.00E+00 -2.14E-03 1.45E-04 -2.60E-05 1.83E-06 -4.14E-08 S13 -1.00E+02 0.00E+00 -1.95E-03 2.44E-04 -2.59E-05 1.56E-06 -2.86E-08

[0263] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig.37 , Fig.38 , Fig.39 , Fig.40 , Fig.41 , Fig.42 shown.

[0264] Fig.37 The field curvature curve of Example 6 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.12mm to 0.05mm, indicating that the optical lens can correct the field curvature well.

[0265] Fig.38 The F-Theta distortion curve of Example 6 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -10% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0266] Fig.39 The relative illumination curve of Example 6 is shown, which represents the relative illumination values ​​at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 50% at the maximum half viewing angle, indicating that the optical lens has a good relative illumination.

[0267] Fig.40 The MTF (Modulation Transfer Function) curve of Example 6 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0268] Fig.41 The axial aberration curve of Example 6 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 20μm, indicating that the optical lens can correct the axial aberration well.

[0269] Fig.42 The vertical chromatic aberration curve of Example 6 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -4 μm to 6 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0270] Example 7

[0271] See also Fig.43 , which is a schematic diagram of the structure of an optical lens provided in Example 7 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0272] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0273] The second lens L2 has negative refractive power, its object side surface S3 is convex, and its image side surface S4 is concave;

[0274] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0275] Aperture ST;

[0276] The fourth lens L4 has negative refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is concave;

[0277] The fifth lens L5 has positive refractive power, and its object-side surface S8 and image-side surface S9 are both convex surfaces;

[0278] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface between the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is S8;

[0279] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0280] The seventh lens L7 has positive refractive power, its object-side surface S12 is convex, and its image-side surface S13 is concave;

[0281] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0282] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0283] The imaging surface S18 is a plane.

[0284] The relevant parameters of each lens in the optical lens in Example 7 are shown in Table 7-1.

[0285] Table 7-1

[0286]

[0287] The surface parameters of the aspherical lens of the optical lens in Example 7 are shown in Table 7-2.

[0288] Table 7-2

[0289] Face number K A B C D E F S12 5.21E+00 0.00E+00 -2.02E-03 -1.04E-04 3.27E-06 -1.11E-06 4.85E-08 S13 1.00E+02 0.00E+00 -8.25E-04 -3.16E-05 -1.06E-05 6.20E-07 -6.57E-09

[0290] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig.44 , Fig.45 , Fig.46 , Fig.47 , Fig.48 , Fig.49 shown.

[0291] Fig.44The field curvature curve of Example 7 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.09mm to 0.05mm, indicating that the optical lens can correct the field curvature well.

[0292] Fig.45 The F-Theta distortion curve of Example 7 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -4% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0293] Fig.46 The relative illumination curve of Example 7 is shown, which represents the relative illumination values ​​at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 50% at the maximum half viewing angle, indicating that the optical lens has a good relative illumination.

[0294] Fig.47 The MTF (Modulation Transfer Function) curve of Example 7 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0295] Fig.48 The axial aberration curve of Example 7 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -5μm to 25μm, indicating that the optical lens can correct the axial aberration well.

[0296] Fig.49The vertical chromatic aberration curve of Example 7 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -3 μm to 6 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0297] Example 8

[0298] See also Fig.50 , which is a schematic diagram of the structure of the optical lens provided in Example 8 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0299] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0300] The second lens L2 has negative refractive power, its object side surface S3 is convex, and its image side surface S4 is concave;

[0301] The third lens L3 has negative refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0302] Aperture ST;

[0303] The fourth lens L4 has negative refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is concave;

[0304] The fifth lens L5 has positive refractive power, and its object-side surface S8 and image-side surface S9 are both convex surfaces;

[0305] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface between the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is S8;

[0306] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0307] The seventh lens L7 has positive refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0308] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0309] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0310] The imaging surface S18 is a plane.

[0311] The relevant parameters of each lens in the optical lens in Example 8 are shown in Table 8-1.

[0312] Table 8-1

[0313]

[0314]

[0315] The surface parameters of the aspherical lens of the optical lens in Example 8 are shown in Table 8-2.

[0316] Table 8-2

[0317] Face number K A B C D E F S12 -2.00E+02 0.00E+00 -9.71E-03 1.57E-03 -6.48E-05 4.77E-07 9.84E-09 S13 2.37E+00 0.00E+00 -4.53E-04 3.03E-04 6.94E-05 -5.72E-06 1.21E-07

[0318] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig.51 , Fig.52 , Fig.53 , Fig.54 , Fig.55 , Fig.56 shown.

[0319] Fig.51 The field curvature curve of Example 8 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.07mm to 0.12mm, indicating that the optical lens can correct the field curvature well.

[0320] Fig.52 The F-Theta distortion curve of Example 8 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -4% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0321] Fig.53 The relative illumination curve of Example 8 is shown, which represents the relative illumination values ​​at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 40% at the maximum half viewing angle, indicating that the optical lens has a good relative illumination.

[0322] Fig.54The MTF (Modulation Transfer Function) curve of Example 8 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.3 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0323] Fig.55 The axial aberration curve of Example 8 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 50μm, indicating that the optical lens can correct the axial aberration well.

[0324] Fig.56 The vertical chromatic aberration curve of Example 8 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -4 μm to 6 μm, indicating that the optical lens can perfectly correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0325] Please refer to Table 9, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value FNO, the real image height IH and the maximum field of view FOV of the optical lens, and the numerical values ​​corresponding to each conditional expression in each embodiment.

[0326] Table 9

[0327]

[0328]

[0329] In summary of the above embodiments, the optical lens provided by the present invention improves the imaging quality of the optical lens, reduces aberrations, and improves the imaging quality of the optical lens through the reasonable configuration of the surface shapes of each lens and the reasonable matching of the optical power.

[0330] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0331] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: The first lens has a negative optical power, and its object side surface is convex and its image side surface is concave; A second lens having negative optical power, whose image side surface is concave; a third lens having optical power and having a convex object-side surface; a fourth lens having negative optical power; a fifth lens having optical power and having a convex object-side surface; a sixth lens having positive refractive power and a convex object-side surface; a seventh lens having positive refractive power; The object-side curvature radius R5 of the third lens and the image-side curvature radius R6 of the third lens satisfy: 0<(R5-R6) / (R5+R6)<4.

0.

2. The optical lens according to claim 1, characterized in that: The total optical length TTL and the effective focal length f of the optical lens satisfy: 8.0 <TTL / f<11.0。 3. The optical lens according to claim 1, characterized in that: The total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 2.5 <TTL / IH<3.5。 4. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens, the arc θ of the maximum half field angle, and the real image height IH corresponding to the maximum field angle satisfy the following: 0.8<(IH / 2) / (f×θ)<1.

0.

5. The optical lens according to claim 1, characterized in that: The maximum field of view FOV and aperture value FNO of the optical lens meet the following requirements: 80° <FOV / FNO<120°。 6. The optical lens according to claim 1, characterized in that: The real image height IH and entrance pupil diameter EPD corresponding to the maximum field of view of the optical lens meet the following requirements: 4.0 <IH / EPD<7.0。 7. The optical lens according to claim 1, characterized in that: The optical back focal length BFL of the optical lens and the effective focal length f satisfy: 1.0 <BFL / f<2.5。 8. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -4.0 <f1 / f<-2.0。 9. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: f2 / f<-2.

0.

10. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -4.5 <f3 / f<9.0。

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